.object {
  background-size: 80% 80%;
  background-position: 50% 50%;
  background-repeat: no-repeat;
  background-image: url("/asset/images/object/normal.png");
}
.object.txt {
  background-image: url("/asset/images/object/txt.ico");
}
.object.html {
  background-image: url("/asset/images/object/html.ico");
}
.object.video {
  background-image: url("/asset/images/object/video.ico");
}
.object.gif {
  background-image: url("/asset/images/object/gif.ico");
}
.object.js {
  background-image: url("/asset/images/object/js.ico");
}
.object.png {
  background-image: url("/asset/images/object/png.ico");
}
.object.jpg {
  background-image: url("/asset/images/object/jpg.ico");
}
